AMAZING

pretty cool! there's something off with the face structure though... maybe the eyes are too high?

i like the detail you put in the septic eye and jack but he is really skinny looks like he is starving great work otherwise

This is pretty good! I really like it! I've watched him on YouTube before. I noticed how a small portion of his hair is green. Those green tips. Not sure if their high-lights or what. You made all his hair green here... but that's okay. The eye symbol, which is used for him, is well-utilized here. Love it. Maybe not so much the one he's standing on...
Anyways, this is great and you did a good job.

I think this looks really cool and you did a great job of creating the pose and having a sense of layers in your picture, all I might add though is to make the head of Jack slightly bigger and make his torso slightly less skinny to add a greater sense of body proportion.
Great picture nonetheless! I hope this helped.